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Volume 9, issue 8 | Copyright

Special issue: Coupled Model Intercomparison Project Phase 6 (CMIP6) Experimental...

Special issue: The Model Intercomparison Project on the climatic response...

Geosci. Model Dev., 9, 2701-2719, 2016
https://doi.org/10.5194/gmd-9-2701-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model experiment description paper 17 Aug 2016

Model experiment description paper | 17 Aug 2016

The Model Intercomparison Project on the climatic response to Volcanic forcing (VolMIP): experimental design and forcing input data for CMIP6

Davide Zanchettin1, Myriam Khodri2, Claudia Timmreck3, Matthew Toohey3,4, Anja Schmidt5, Edwin P. Gerber6, Gabriele Hegerl7, Alan Robock8, Francesco S. R. Pausata9, William T. Ball10,11, Susanne E. Bauer12, Slimane Bekki13, Sandip S. Dhomse5, Allegra N. LeGrande12, Graham W. Mann5,14, Lauren Marshall5, Michael Mills15, Marion Marchand13, Ulrike Niemeier3, Virginie Poulain2, Eugene Rozanov10, Angelo Rubino1, Andrea Stenke11, Kostas Tsigaridis12, and Fiona Tummon11 Davide Zanchettin et al.
  • 1Department of Environmental Sciences, Informatics and Statistics, University of Venice, Mestre, Italy
  • 2IRD/IPSL/Laboratoire d'Océanographie et du Climat, Paris, France
  • 3Max Planck Institute for Meteorology, Hamburg, Germany
  • 4GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 5Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK
  • 6Courant Institute of Mathematical Sciences, New York University, New York, NY, USA
  • 7School of Geosciences, University of Edinburgh, Edinburgh, UK
  • 8Department of Environmental Sciences, Rutgers University, New Brunswick, NJ, USA
  • 9Department of Meteorology, Stockholm University and Bolin Centre for Climate Research, Stockholm, Sweden
  • 10PMOD/WRC, Davos, Switzerland
  • 11Department of Environmental Systems Science, Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
  • 12NASA Goddard Institute for Space Studies and Center for Climate Systems Research, Columbia University, New York, NY, USA
  • 13LATMOS/IPSL, UVSQ Université Paris-Saclay, UPMC, CNRS, Guyancourt, France
  • 14National Centre for Atmospheric Science, University of Leeds, Leeds, UK
  • 15Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USA

Abstract. The enhancement of the stratospheric aerosol layer by volcanic eruptions induces a complex set of responses causing global and regional climate effects on a broad range of timescales. Uncertainties exist regarding the climatic response to strong volcanic forcing identified in coupled climate simulations that contributed to the fifth phase of the Coupled Model Intercomparison Project (CMIP5). In order to better understand the sources of these model diversities, the Model Intercomparison Project on the climatic response to Volcanic forcing (VolMIP) has defined a coordinated set of idealized volcanic perturbation experiments to be carried out in alignment with the CMIP6 protocol. VolMIP provides a common stratospheric aerosol data set for each experiment to minimize differences in the applied volcanic forcing. It defines a set of initial conditions to assess how internal climate variability contributes to determining the response. VolMIP will assess to what extent volcanically forced responses of the coupled ocean–atmosphere system are robustly simulated by state-of-the-art coupled climate models and identify the causes that limit robust simulated behavior, especially differences in the treatment of physical processes. This paper illustrates the design of the idealized volcanic perturbation experiments in the VolMIP protocol and describes the common aerosol forcing input data sets to be used.

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Simulating volcanically-forced climate variability is a challenging task for climate models. The Model Intercomparison Project on the climatic response to volcanic forcing (VolMIP) – an endorsed contribution to CMIP6 – defines a protocol for idealized volcanic-perturbation experiments to improve comparability of results across different climate models. This paper illustrates the design of VolMIP's experiments and describes the aerosol forcing input datasets to be used.
Simulating volcanically-forced climate variability is a challenging task for climate models. The...
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